Floating-tool holder



Filed Jan. 6. 1930 2 Sheets-Sheet l Jan. 6, 1931. A. F. BREITENSTEIN FLOATING TOOL HOLDER 2 Shee ts-Sheet 2 Filed Jan 6. 1930 Patented Jan. 6, 1931 1. y- STATES METRIC 'roor. COMPANY, or NEW HAVEN, oonmio'rroor, A CORPORATION FLOATING-TOOL HOLDER Application filed January 6, 1930. Serial no; 418,968.

use in turret-lathes and kindred machines in l which they are yieldingly mounted to compensate for the rigidity and massof such machines and for the varying human factors.

in manually feeding the same, so that there will be some Compensation between the tool and the article being operated upon, whereby accidents are avoided and the perfect cutting of delicate threads, for instance, insured. Tools so yieldingly mounted are described in the trade and by their users as floating tools.

My improved floating-tool holder is constructed with particular reference to extreme simplicity and sensitiveness, so as to enable die-heads, taps, re amers, and the like, to be used for delicate work in conjunction with very heavy turretlathes, or corresponding machines.

With these ends in View, my invention consists in a floating-tool holder characterized by its provision with an anti-friction ballbearing arranged to couple the tool-holder and the tool so as to prevent their relative rotation and to reduce the friction of their relative axial or floating movement to the mimimum.

My invention further consists in a floatingtool holder characterized as above and having certain details of construction and combinations of parts as will be hereinafter described an'd particularly recited in the claim.

For the purpose of illustration, I have shown my improved floating-tool holder as applied to a die-head of the familiar pull-ofi type, but I wish to have it distinctly understood that my improved holder is available for use with other types of die-heads, with improved floating-tool holder shown as car-r ALBERT F, BREI'IENSTEIN, OF NEW CONNECTICUT, ASSIGNOR TO THE GEO- sag a pull-ofi die-head or a e-sad a struction; y r y fFig. 1s a'VlGW- 1n rear-end elevation there- 0 1 T :Fig. 3 isan enlarged-scale View generally corresponding to ig. 1 but showing the floats ing-tool holder in central horizontal section 1 on the 111163-13 of Fig. 1,:and the back-meme ber of the die-head. also partlyin'section;

Fig. dis acorresponding view, shown with the die-head'in its rearward position;

Fig.5 is a view corresponding to Fig. 3 but taken at a right angle thereto on the line 5- 5 "Fig.6 isan enlarged-scaleview in transverse section onthe line 66 of Fig1;

"Fig. 7 is a corresponding View on the line 770fFig.1;'

Fig. 8 is a detached perspective view of the body-member of the floating-tool holder; and

Fig. 9 is a broken perspective view of the back-member of thedie-head.

t The pull-off die-head herein shown being of known construction, it will be sufiicient to apply the numeral 10 to it for its general designation. Such die-head maybe of any known construction throughout save as 'toits back-member 11, which is provided with their bulk into corresponding semicircular grooves 15 located opposite each other in the inner periphery of a sleeve 16 forming an integral part of the main or body-member 17 of my improved floating-tool holder, which member 17 as shown, is oblong in shape and providedin its corners with holes 18 for the 7 reception of bolts (notTshown) by which the holder is rigidly secured to the face of the turret of a lathe-or other machine Which is not shown. However, the particular adaptation of the holder to be rigidly secured to a turret or other machine is no part of my invention and may be varied as circumstances may require. The said balls 14: are held 7 against displacement in one directionby radial stop-screws 19 (Fig. 6) mounted in the holder-body 17, and in the opposite direction by stop-pins20 mounted in the shank 12, as shown in Fig. 3 and elsewhere. I As thus applied, the two roups of balls 14 couple the holder-body 1 which, as described, is secured to theface-plate of the turret with the die-head 10 and prevent their relatiYero-H tation and at the same time form an anti-- friction connection between the two unitsy" i. e., the machine and thetool carried by it,

whereby the friction of their relative axial movement is reduced to the minimum. For this axial movement, allowance is made by a gap 21 between the back-member 11 of the die-head 10 and the adjacent face of the body 17 of'the tool-holder, this gap being shown at its maximum in Fig. 3, and at its minimum in Fig. 4. This gap is normally maintained by means of buffer-pins 22'located in sock ets 23 in the holder-body'l7 and by helical springs 24 in the bottoms of such sockets.

The pins 22 impinge against the face of the V back-member 11 and under theinfluence of their springs :24 exert a constant effort to maintain the gap 21 at its maximum. It will be understood that as the work is fed into the die-heads, the springs 24am be somewhat position to engage the oppositeend of the 1 compressed and the gap kept partly closed, dependent upon the pressures developed in the cutting operation. The gap, underthese with a longitudinal ball-receiving groove,

complementing the ball-receiving groove in the said bore; a series-of balls installed in the said grooves for coupling the said mounting mem'ber'and the said tool-carrying mem' ber. together against relative rotation; an

abutment screw carried by the said mounting-member and projecting into the ball-re ceiving groove in the-bore thereof, in position to engage one end of the said series of balls, and retirable to permit the separation of the said members; and a second abutment carried by the said cylindrical shank and pro jecting into the longitudinal groove therein said series of balls.

In testimony whereof, Ivhave signed this specification.

ALBERT 'F. BREITENSTEIN. 

